A.J. Hoffman
Mathematics of Computation
Let A = (aij) be a real square matrix of order n with nonnegative entries, and let M(A) be the class of all complex matrices B = (bij) of order n such that, for all i, j, |bij| = aij. If every matrix in M(A) is nonsingular, we say M(A) is regular, and it is the purpose of this note to investigate conditions under which M(A) is regular. © 1966 by Pacific Journal of Mathematics.
A.J. Hoffman
Mathematics of Computation
A.J. Hoffman
Mathematical Programming
Emilie Haynsworth, A.J. Hoffman
Linear Algebra and Its Applications
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Mathematical Programming